Lanyrd is an online social conference directory that helps you keep tabs on the people and events related to conferences you're attending or should be attending. In addition to a native iOS app, they've built a slick HTML5 mobile site that works well across a myriad of devices.
Thanks to their new connected app integration, Lanyrd now gives relevant information to people on foursquare, like details about upcoming events, the moment they check in to a place that's hosting a conference. If you were already planning on attending the event or are a registered speaker, they also add a post to your check-in telling friends why you're at the conference. Conference fiends, click below to connect Lanyrd to your foursquare account.